Minimalist here too but sometimes DH carries backpack for the family and here is what we carry.
In my pockets (I only bring my pants, skirts or shorts that have lots of pockets) -- we are a family of 4 (2 teen boys, DH and me, a middle aged woman)
- phone
- small phone charger and small cord
- lipgloss
- credit/giftcards/hotel key in plastic size ziplock that I can also put my phone in on Splash/Rapids
- hair tie
- contacts case w/solution inside
I wear wicking clothes and shoes that are quick drying--kind of meshy but have arch support. I tie jacket around my waist and sunglasses on my face which will go in my pockets or when sun goes down.
In backpack:
- sweatshirts and/or light jackets. I'll throw a pair of pants for me that I can slip on in evening because I get cold
- sunscreen stick for touchups
- phone charger and cord
- sometimes flip flops for the kids for the water rides but if they don't want to use them, we just have them take off/stash their socks (and sometimes underwear ha ha) before the rides as those are what takes forever to dry
- empty water bladder (platypus) / bottle that we fill up. Though usually we end up buying a coke, rinsing the bottle out and using water
- extra ziplock bag for phones on water rides.
We used to bring a lot more but found that it just got heavy and we didn't use half of it. I try to avoid going through the bag check line if I can help it so I make hard decisions if something doesn't fit in my pockets.